Alternative education in Germany returning to Nazi-era repression?

It appears as if the legal status of homeschooling in Germany is about equivalent to what it was in Nebraska, United States, back in the mid-80s. (Yes, people in Nebraska were being put in prison for homeschooling back in the mid-80s.)

Check out "POLICE STATE, GERMANY: 'Youth worker' lies about homeschool student". I see it as a pretty intractable problem.

How can a government, rightly (I think) concerned about "parallel societies" [think unassimilated Muslim fundamentalists, by way of example] . . . --How can a government deal with its legitimate concerns while also permitting freedom of conscience, freedom of inquiry, and freedom to pursue alternative perspectives?